/Engine/Plugins/Runtime/GameplayAbilities/Source/GameplayAbilities/Public/AbilitySystemComponent.h
Dynamically update the set-by-caller magnitude for an active gameplay effect
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, BlueprintAuthorityOnly, Category=GameplayEffects) virtual void UpdateActiveGameplayEffectSetByCallerMagnitude ( [FActiveGameplayEffectHandle](API\Plugins\GameplayAbilities\FActiveGameplayEffectHandle) ActiveHandle, [FGameplayTag](API\Runtime\GameplayTags\FGameplayTag) SetByCallerTag, float NewValue )